Definatly eggcrate, also cheap at home depot. Less money than plexi andmeasier to work with. Youcan get plastic mesh from craft store and cover the eggcrate to keep fry on one side
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Egg create might be cheaper but plexi is stronger and if u will have it for a long time and you can drill holes so you will all the flow you need and also home depot will cut it to the size you need and for me it was only 18 bucks for the size I needed